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→Solution gas to oil ratio
===Solution gas to oil ratio===
===Solution gas to oil ratio===
Engineers forecast ultimate recoverable reserves by applying material balance equations or decline curve analysis to production history records. For example, in a depletion-type reservoir, the solution gas to oil ratio is sometimes plotted versus cumulative oil production on semilog paper.<ref name=pt06r37>Garb, F. A., Smith, G. L., 1987, Estimation of oil and gas reserves, in Bradley, H. B., ed., Petroleum Engineering Handbook: Richardson, TX, Society of Petroleum Engineers, p. 4-1–40-38.</ref> If such a curve shows a good straight-line relationship, the curve can be used to predict the trend of a cumulative gas or cumulative oil plot to estimate ultimate recovery.
Engineers forecast [[Reserves estimation|ultimate recoverable reserves]] by applying material balance equations or [[Production histories#Decline curve analysis|decline curve analysis]] to production history records. For example, in a [[Drive mechanisms and recovery#Solution gas drive|depletion]]-type reservoir, the solution gas to oil ratio is sometimes plotted versus cumulative oil production on semilog paper.<ref name=pt06r37>Garb, F. A., Smith, G. L., 1987, Estimation of oil and gas reserves, in Bradley, H. B., ed., Petroleum Engineering Handbook: Richardson, TX, Society of Petroleum Engineers, p. 4-1–40-38.</ref> If such a curve shows a good straight-line relationship, the curve can be used to predict the trend of a cumulative gas or cumulative oil plot to estimate ultimate recovery.
The solution gas to oil ratio (GOR) is the amount of dissolved gas that will evolve from the oil as the pressure is reduced to atmospheric from some higher pressure. GOR is usually expressed in units of SCF gas/STB oil. A barrel of oil and its solution gas at reservoir conditions of temperature and pressure will usually “shrink” as the fluid is produced and brought to stock tank conditions (normally reported at [[temperature::60°F]] and 14.7 psia). As GOR changes during reservoir life, GORs for individual wells can be mapped periodically to identify areas of the reservoir receiving or not receiving pressure support and serving as indicators for reservoir management action.
The solution gas to oil ratio (GOR) is the amount of dissolved gas that will evolve from the oil as the pressure is reduced to atmospheric from some higher pressure. GOR is usually expressed in units of SCF gas/STB oil. A barrel of oil and its solution gas at reservoir conditions of temperature and pressure will usually “shrink” as the fluid is produced and brought to stock tank conditions (normally reported at [[temperature::60°F]] and 14.7 psia). As GOR changes during reservoir life, GORs for individual wells can be mapped periodically to identify areas of the reservoir receiving or not receiving pressure support and serving as indicators for reservoir management action.